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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HDFS-980) Convert FSNamesystem lock to ReadWriteLock
Date Wed, 14 Apr 2010 05:44:56 GMT

     [ https://issues.apache.org/jira/browse/HDFS-980?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur resolved HDFS-980.
-----------------------------------

    Resolution: Duplicate

Duplicate of HDFS-1093

> Convert FSNamesystem lock to ReadWriteLock
> ------------------------------------------
>
>                 Key: HDFS-980
>                 URL: https://issues.apache.org/jira/browse/HDFS-980
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>
> As Dhruba noted [here|https://issues.apache.org/jira/browse/HDFS-909?focusedCommentId=12834051&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12834051]
 there would be substantial benefits to converting the FSNamesystem lock over to a ReadWriteLock.
The first would be an ability to provide concurrent readers with a throughput increase, and
the second would be more safety for operations like in HDFS-909.

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